Motor controller



I. H. RODMAN.

MOTOR CONTROLLER.

APPLICATION man AUGJI, 1920.

Patented July 11, 1922.

3 SHEETS-SHEET I- Fig/.1.

09mm 7h0mcw J-i Roma/n T. H; RODMAN.

VMOTOH CONTROLLER.

APPLICAHON FILED AUG.27. 1-9'20 1,422.134- Patented July 11, 1922.

3 5HEETSSHEET 2.

hwy/1AM Jhom filiod/mam n 1 ll UNITED STATES PATENT OFFICE.

THOMAS H. BODMAN, OF NEW YORK, N. Y., ASSIGNOB TO THE CUTLEBFHAHMER MFG.

, C0., 0! MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.-

KOTOB CONTROLLER.

Specification of Letters Patent.

Patented July 1 1, 1922.

Application filed August 27, 1920. Serial Ho. 406,505.

To all it may concern:

Be it known that I, Tnoius H. RODMAN,

a citizen of the United States, residing at,

of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a art of this specification.

his invention relates to motor controllers and whilenot limited thereto is particularly applicable to controllers for printin presses.

eretofore it has been customary to provide each control station of a printing press with a so-called safe switch adapted to be set manually to render all control stations ineffective for starting pending subsequent o ration of the switch so set. However, t e protection afforded by such switches is rendered uncertain by reasonof the fact that it is dependent upon an additional manual operation and hence dependentnlpon the thoughtfulness of the operatives whereas failure to guard against accidenlal starting or starting without due notiu: often leads to serious consequences.

The present invention has among its ob jects to provide a controller having safety means which will greatly minimize the danger to which the attendants of the press or other controlled machine are subjected.

Another object is to provide safety means capable of use in conjunction with safety means of the aforesaid character now in use.

Another object is to provide such additional safety means which may be readily embodied in various existing types of controllers.

Another object is to provide such addi tional safety means applicable to controllers for a single motor drive, a double motor drive or a plurality of drives of either type. Various other objects and advantages of the invention will hereinafter appear.

The accompanying drawing illustrates a controller embodying the invention in one form and the same will now be described, it being understood that the controller illustrated is susceptible of various modifications without departing from the of the ap nded claims.

In t e drawing,

Fig. 1 is a diagrammatic view of the controller;

Fig. 2 is a so-called across the line diagram illustrating the preferred motor connections; and

Figs. 3 to 5 are similar diagrams illustrating-certain of the circuit connections of Fig. 1 in a manner to facilitate an under standing thereof.

Referring to Fig. 1 the controller illustrated therein is designed for a double motor drive shown in Fig. 2 as com risin a, small motor M and a large motor his controller comprises an electro responsive main switch 1 for the small motor, an electro responsive main switch 2 and dynamic brake switch 3 for the large motor and a cross head type rheostat R driven by a pilot motor M to control said switches and to further control an armature resistance r and a field resistance r for the large motor M, the resistance 1' being omitted from Fig. 1 but its contacts being ilhistrated therein and designated bv the same reference character. An on relay 4 is provided to effect operation of the pilot motor for starting the motors M and M successively and for accelerating the latter while an olPrelay 5 is provided to effect reverse operation of the pilot motor. Also the controller includes a stop" relay 6 to stop both motors, an inch relay 7 to start and stop the small motor M, a safe relay 8 to render all of the aforesaid relays inoperative, a paper-break relay 9, and signal relays 10 and 11, all of said relays being under the control of a )ush-button station comprising anonswitc l l2,astopswitch 13, an off switch 14, a safe switch L'L an inch" switch 10, and a reset switch [7. \Nhile Fig. 1 shows but a single control station a plurality thereof may be provided as will hereinafter appear.

The switches 1 and 2 are preferably employed to establish the motor connect-ions shown in Fig. 2, each of said switches being of the double pole type and having down contacts coacting to establish a dynamic braking circuit for its respective motor. Each motor is shown as comprising an armature a, a series field/and a shunt field f", the motor M having in circuit therewith the armature resistance 1' and field resistance r to be controlled by the motor-driven crosshead. Also the motors M and M are shown as respectively provided with resistances r and r in the dynamic braking circuits-thereof, the motor M having included in the dynamic braking circuit switch 3 which is of the normally closed type.

The on and oti relays respectively establish the circuit connections for the ilot motor shown in Fig. 3, the pilot motor )eing shown therein as comprising an armaturc a and a series field f. Referring to lhis figure. it will be observed that the on" 'relay which is of the double-pole type establishes connections whereby current flows through the armature and field in reverse directions whereas the off relay, which is of a similar type establishes connections for a unidirectional flow of current through both the armature and field.

The rheostat R has a main crosshead 1S and an auxiliary crosshead 19 the former coacting with contacts to control resistance 1- and r and the latter coacting with the auxiliary contacts to control the windings of switches l to 3 as best illustrated in Fig. 4-. This figure shows such auxiliary contacts and as will be observed the auxiliary crosshead 19 in its extreme position serves to connect contacts 20, 2t and 22 for connection of both the small motor switch 1 and large motor dynamic hrak'. switch 3 across the line through the inch relay 7, paper-brake relay 9 and stop relay 6, relay 7 being normally 0 )cn and relays 9 and (3 being normally closei Thus in this position of the crosshead the small motor may be operated for inching by energizing relay 7. ()n the other hand when the rhcostat is operated crosshead 19 leaves contacts 20. 21 and 22 interrupting the circuit through the inch relay and inserting interlocking resistances r and 1" in circuit with the windigs of switches 1 and 3 respectively to necessitate return of the crosshead to initial position for re-energization of said switches following de-energization thereof. Upon initial movement of the crosshead 19 the same engages and bridges contacts 23, 24 and 25 which, assuming previous energi'nation of switch 1 and 3, pro vides maintaining circuits therefor through auxiliary contacts 1 of switch 1 (Fig. 1). As will hereinafter appear, the inch" relay is energized by closure of the on relay and thus both switches 1 and 3 are energized when the crosshead 19 is first movedand the former switch is maintained energized until said crossheac Iisengages contact 23. Prior thereto the crosshead 19 engages contact 26 to complete the circuit of the large motor'swit'ch through the auxiliary contacts 1 of switch 1 and before disengaging contact 23 the crosshead engages contact 27 to parallel said auxiliary contacts by auxiliary contacts 2 of switch 2 (Fig. 1). Thus the auxiliary crosshead provides for starting the motors successivel and de-energizing the main switch of the small motor afterstarting the large motor while maintaining the large motor switches 2 and 3 energized throughout the remainder of its movement, subject of course to de-energization by either the stop relay or paper-brake relay. As will be understood the auxiliary crosshead remains in engagement with contacts 24, 26 and 27 during movement of the main crosshead to var the armature and field resistances of the arge motor.

The ush button station of Fig. 1 serves to esta lish the circuit connections shown in Fig. 5. the latter showin duplicate control stations. Referring to Tig. 5 the on switches 12 are connected in parallel and each serves to connect the winding of the on" relay 4 across the line through the normally closed safe" relay 8 and down limit switch 28 of the rheostat (Fig. 1). Thus the on relay 4 is rendered responsive to either on switch to complete the pilot motor connections as described while its auxiliary contacts 4' (Fig. 1) parallel the inch switches 16 (Fig. 5) to energize the inch relay for starting of the small motor and energization of the dynamic brake switch 3 of the large motor as above set forth.

The oil switches 14 as shown in Fi 5 are also connected in parallel and eaci serves to connect the winding of the off relay 5 across the line through the safe relay 8 and up limit switch 29 of the rheostat (Fig. 1). Thus the off relay is responsive to either off switch to com lete the escribed pilot motor connections as above for slow down.

The inch switches 16 as shown in Fig. 5 have down contacts connected in parallel and either is adapted to be depressed to connect the windin of the inch relay 7 across the line throng safe relay 8 whereby the inch relay is rendered res onsive to start the small motor as above (escribed. Also the inch switches 16 have up contacts connected in series and said switches normally connect the winding of the pa wr-break relay 9 acrom the line throng: parallel paper-break switches 30 each of which is adapted to be normally held open by the paper passing through the press subject to release upon breakage of the paper. Thus with the inch switches 16 in normal position releam of either paperbreak switch 30 energizes paper-break rela 9 to stop the motors as above described. n the other hand depression of either of'the switches 16 for inching interrupts the circuit of the paper-break relay thus permitting the press to be inched for rethreading or to be operated at a higher speed if desired by operation of one of the on switches 12 in addition to the inch" switch 16.

The safe switches 15 as Shown in Fig. 5 are connected in parallel and either is adapted to be set to connect the winding of safe relay 8 directly across the line for ener ization of said relay to disconnect the win ings of the on, 01% and inch relays from line L. Such setting of the safe" switch thus renders all control stations ineffective to start. However, such settingot the safe switch requires a manual operation in addition to the operation of stopping as will appear.

The stop relay 6 is normally closed (Figs. 1 and 4) and requires depression of a stop switch 13 for stopping at will. As shown in Fig. 5, stop switches 13 are connected in parallel and either is adapted to be depressed to connect the winding of stop relay 6 across the line through upper contacts of the reset switches 17 which are connected in series. This energizes the stop relay to stop both motors as above set forth and said relay has auxiliary contacts 6" (Fig. 1) which upon response thereofparallel the oil switches 14 as shown in Fig. 5 'to effect return of the rheostat crossheads to their initial positions. The main switches 1 and 2 for the motors M and M are respectively provided with auxiliary contacts 1 and 2 (Fig. 1) which upon opening of said switches parallel the stop" switches 13 (Fig. 5) through an up limit switch 31 of the rheostat (I i 1) thereby energizing the stop relay w enever both motors are stopped as for example by the paper break relay.

Thus the stop relay is energizable in a number of different ways for stopping and upon response thereof its auxiliary contacts 6" (Fig. 1) establish a maintaining circuit therefor through the upper contacts of the reset switches 17 and a resistance 1". In consequence the stop relay-also t'unctions automatically as a safe relay requiring operation of one of the reset switches 17 to de-energize the same before the motors M and M can be restarted either by the on" switch or the inch" switch. In this connection it is to be understood that any number of reset switches may be provided there preferably being one for each control station as shown.

The reset switches 17 also have down contacts connected in parallel and each serves when depressed to connect the signal relay 11 across the line through the safe relay 8 as shown in Fig. 5 and this relay shown in Fig". 1 serves to connect across the line an electric horn 32 or other audible signal device and one or more lamps 33 having in circuit therewith a flasher 34. Thus when either reset switch 17 is operated to make ready for starting it tunctionsto give both an audible and a visual signal and it may be operated at any time to give such signal even though its operation 15 not required for control of the stop relay. As shown the signal relay 11 has down contacts 11 also functioning to energize the lamps 33 and to shunt the flasher 34 when the press is idle.

For additional protection a red light 35 (Fig. 1) is also provided, the same being under the control of relay 10. This relay as shown in Fig. 4 has its winding connected across the line throu h the safe relay 8 on the one side and t e paper-break and stop relays on the other side whereby it is energized to complete the circuit of the red light whenever the controller is ready for starting in response to either the on switch" or the inch switch.

What I claim as new and desire to secure by Letters Patent is:

1. In a motor controller the combination with starting and stopping means including manually operable starting and stopping switches, of means requiring manual operation of a nut thereof to render said starting switch e ective for restarting following operation of said stopping switch.

2. In a motor controller the combination with starting and stopping means including a plurality of control stations each having starting and stopping switches, of a plurality of additional switches and circuit connections between the latter and said means necessitating operation of one of the same to render said starting switches effective for restarting following operation of any one of said stopping switches.

3. In a motor controller in combination power operated start-in and sto ping means, a control station there or inclu ing starting. stopping and resetting elements and connections requiring operation of said resetting element as a prerequisite to use of said start ing element for restarting after operation of said stopping element.

4. In a motor controller in combination power operated starting and sto ping means, a plurality of control stations tierefor, each including starting, stopping and resetting elements. and connections rendering each of said starting, elements ineffective to restart after operation of one of said stopping elements until one of said resetting elements is operated.

5. In a motor controller, the combination der given conditions, of means requiring manual operation of a part thereof to render said starting element effective for restarting following stopping by either of the other of said elements.

G. In a printing press controller, the coinhination with motor starting and stopping means including manually operable control clements to effect starting and stopping at will and also including an element to effect stopping automatically upon weh breakage, of means requiring manual operation of a part thereof to render said starting element effective for restarting following stopping by either of the other of said elements.

7. In a printing press controller, the comhination with power operated starting and stopping means, of a plurality of manually operable control elements therefor. one to effect starting for inching. another to effect starting for running and another to effect stopping and means lt't uiring manual operation of an element t iereof prior to restarting by either of said starting elements following stopping by the other of said clements. i

8. In a printing press controller. the combination with motor starting and stopping means including a plurality of manually operahle control elements one to effect starting for running, another to effect stopping and another to effect. both starting and stopping for inching, of means requirmg manual operation of an element thereof prior to re starting by either of said starting clcnn-nts following stopping hy the second mentioned element, said inching element lacing effective for stopping and restarting thereby independently of the last mentioned means.

9. In a motor controller, in combination, manually operable start, 1p and reset elements and a relay responsive to said stop elements, adapted upon response to render said start element ineffective pending suhsequent operation of said reset element.

10. In a motor controller, In combination,

manually operahle start. stop and reset ele nients, a relay responi-rtvc to 311 stop ele Inent and adapted upon responding to render said start element ineffective and a maintaining circuit for said relay completed thereby upon response thereof to necessitate subsequent operation of said reset element for its de-encrgization.

ll. In a motor controller the combination with starting and stopping means including a stop relay, of start, stop and reset olements to control said means and connections rendering said stop relay res mnsire to said stop element and further rendering said start clement ineffective p nding operation of said reset element to release said stop element.

12. In a motor controller the comhination with starting and stopping means including a stop relay, of start. stop and reset elements to control said means and conm-ctions rendering said stop relay responsive to said stop element and further rendering said relay after response thereof. self maintaining independently of said stop and start elements .hut subject to release hy said reset clement.

III. In a motor controller, the coinhination with starting and stopping means including separate relays for starting andstop ping and separate control switches therefor. ofadditional control means for said stopping relay rendering the same cfl'ectirc upon each stoppingoperation thereof to prevent restarting pending manual operation of an element of said additional control means.

l4. In a motor controller. the combination with electro-rcsponsirc starting and stopping means including separate relays for starting and stopping, of a control statioincluding a plurality of switches to control said relays and circuit connections necessitating operin tion of a plurality of said switches to offcct restarting, following stopping hy said stopping relay.

in witness whereof, I have hereunto su hscrihed my name. 7

THOMAS H. RUDMAN. 

